the left side is kinda blah with it just being black...the focal point it too bright...tone it down a bit and the render needs to be blended a little better.
I definitely enjoy the right side a lot more than the left. The negative space on the left is a big downer and i do agree the render should be blended a bit as well.
The background looks pretty good but it's monotone. The bright near the render is way to bright for me. The switch to pink is very sudden. The black tree looks really good and has nice flow. This is pretty good but it has some flaws. 7/10